Design of Fuzzy and HBCC based Adaptive PI Control Strategy of an Islanded Microgrid System with Solid-Oxide Fuel Cell

Subhashree Choudhury, Pravat Kumar Rout

Abstract

In Microgrid environment distributed generating (DG) systems are more vulnerable to load disturbance and fault during islanded mode of operation. So it is necessary to maintain the stability of the islanded system during the transient conditions. This work mainly focuses on the performance of the proposed approach Adaptive PI controller (APIC) applied on an islanded Microgrid system integrated with a Solid-Oxide Fuel Cell (SOFC) DG. A P-V control strategy is implemented for maintaining the stability of the system to restore the continuity, reliability and power quality under linear load, non-linear load and voltage variation. The SOFC establishes the modulation technique with a PWM method. The performance of the proposed controller is further improved by using an adaptive hysteresis band calculation (HBCC). A comparative result of proposed algorithm with Conventional PI and Fuzzy PI are demonstrated and its enhanced control performance is presented on the basis of settling time, rise time, peak overshoot, peak undershoot and damping oscillations of system parameters. A detailed mathematical model of the SOFC stack controller and other system components are presented in detail and are simulated in MATLAB/SIMULINK environment.